Overview

Common causes

Your Cloudflare DNS configuration does not have an A DNS record that matches the origin IP address.

You have a CNAME DNS record pointing to an external domain that cannot be resolved.

You're using Cloudflare Load Balancer and the origin host names (CNAMEs) in your default/region and fallback pools cannot be resolved via DNS. Use a fallback pool configured with an origin IP as a backup in case all other pools are unavailable.

Troubleshoot Error 1016

To solve Error 106, ensure the origin IP address is resolvable through DNS. You can try the following:

Verify that your Cloudflare DNS settings include an A record that points to a valid IP address. You could edit an existing A record or create a new one.

For a CNAME record pointing to an external domain, ensure that the target domain can be resolved. See below for help with verifying DNS resolution of an external record.

Verify DNS resolution of an external record

You can use some command line tools as well as third-party tools to check DNS resolution.